Fast Ethernet Adapter Installation and Support Guide

Glossary
Fast Ethernet Adapter Installation and Support Guide—425685-003
Glossary-69
pending signal
pending signal. A signal that has been generated for a process but has not been delivered.
Pending signals are usually blocked signals.
periodic incident report. A type of incident report that is generated periodically to test the
connection to the service provider and report the current system configuration. The
default frequency is 20 days.
peripheral enclosure. An enclosure that contains components related to one or more
peripherals. The 519x tape subsystem is an example of a peripheral enclosure.
Peripheral enclosures are not part of the set of system enclosures. Contrast with
system enclosure.
Peripheral Utility Program (PUP). A utility used in D-series and earlier release version
updates (RVUs) to manage disks and other peripheral devices. In G-series RVUs,
similar functions are performed by the Subsystem Control Facility (SCF).
persistence. For the Subsystem Control Facility (SCF), the capability of a generic process
to restart automatically if it was stopped abnormally. You configure this capability by
specifying a nonzero AUTORESTART value in an ADD command.
persistence count. The number of times the $ZPM persistence manager process will
restart a generic process that has been terminated abnormally. A generic process with
an AUTORESTART value of 10 (the maximum) is said to have a persistence count of
10. See also persistence.
persistence manager process. The $ZPM process that is started and managed by the
$ZCNF configuration utility process and that starts generic processes in G-series
release version updates (RVUs) and manages their persistence.
persistent configuration. A configuration that remains the same from one system load to
another.
persistent process. A process that must always be either waiting, ready, or executing.
Persistent processes are usually controlled by a monitor process that checks on the
status of persistent processes and restarts them, if necessary.
phase-loss detector/contactor (PDC). Equipment used to detect the interruption (for 50
milliseconds or longer) or the complete loss of one or more phases of power to
computer equipment. Upon detection of a phase dropout, the contactor shuts down all
input phases to the system equipment, thereby allowing smooth system shutdown and
recovery.
physical interface (PIF). The hardware components that connect a system node to a
network.
physical link interfaces. Communications standards defined by standards organizations.
The following physical link interfaces are supported for the ServerNet wide area
network (SWAN) concentrator: RS-232, RS-442, RS-449, V.35, and X.21.